This is the 1403rd most frequent Turkish word.
çoğu
Most of; majority.
Here, 'çoğu' means 'most' and is used as a quantifier for 'insan', indicating the majority of people.
Çoğu insan sabah kahve içmeyi sever.
Most people like to drink coffee in the morning.
In this sentence, 'çoğu' refers to 'most' of the entity 'kitaplar' (books), showing partial inclusion within a group.
Kitapların çoğunu okudum.
I have read most of the books.
Here, 'çoğu' is used to mean 'most' and modifies 'zaman', indicating frequency or probability.